APA استشهاد

Certo, S. C. (1989). Principles of modern management: Functions and systems (4 edition.).

استشهاد بنمط شيكاغو

Certo, Samuel C. Principles of Modern Management: Functions and Systems. 4 edition. Allyn and Bacon: London, 1989.

MLA استشهاد

Certo, Samuel C. Principles of Modern Management: Functions and Systems. 4 edition. 1989.